摘要
该文研究OFDM系统中低复杂性最小二乘方(LS)信道估计技术,为了改善LS估计的OFDM在严重多径信道中错误平底效应,分集接收和Turbo乘积编码用于系统设计。数值仿真结果表明,Turbo乘积编码和分集接收可以减小LS估计的OFDM系统的错误平底效应,其性能比已知信道参数系统的性能只恶化4dB。
The low-complexity Least Square (LS) channel estimation in Orthogonal Frequency Division Multiplexing (OFDM) is studied in this paper. To reduce the error floor of OFDM with LS channel estimation, the diversity reception and turbo product coding are used in system design. The simulation results show that the turbo product coding and diversity combining can reduce the error floor in seriously frequency-selective channel. The gap of the OFDM system with LS channel estimation and with channel state information is only 4dB.
出处
《电子与信息学报》
EI
CSCD
北大核心
2004年第5期820-824,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金重大研究计划资助课题(90104019)